/*!	 valuenode_segcalcvertex.cpp
**	 Implementation of the "Segment Vertex" valuenode conversion.
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007, 2008 Chris Moore
**  Copyright (c) 2011 Carlos López
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include "valuenode_segcalcvertex.h"
#include "valuenode_const.h"
#include "valuenode_composite.h"
#include <synfig/general.h>
#include <synfig/localization.h>
#include <synfig/valuenode_registry.h>
#include <synfig/exception.h>
#include <ETL/hermite>
#include <synfig/segment.h>

#endif

using namespace std;
using namespace etl;
using namespace synfig;

REGISTER_VALUENODE(ValueNode_SegCalcVertex, RELEASE_VERSION_0_61_06, "segcalcvertex", "Segment Vertex")

ValueNode_SegCalcVertex::ValueNode_SegCalcVertex(Type &x):
    LinkableValueNode(x)
{
    Vocab ret(get_children_vocab());
    set_children_vocab(ret);

    if (x != type_vector) {
        throw Exception::BadType(x.description.local_name);
    }

    set_link("segment", ValueNode_Const::create(type_segment));
    set_link("amount", ValueNode_Const::create(Real(0.5)));
}

ValueNode_SegCalcVertex*
ValueNode_SegCalcVertex::create(const ValueBase &x)
{
    return new ValueNode_SegCalcVertex(x.get_type());
}

ValueNode_SegCalcVertex::~ValueNode_SegCalcVertex()
{
    unlink_all();
}

ValueBase
ValueNode_SegCalcVertex::operator()(Time t)const
{
    if (getenv("SYNFIG_DEBUG_VALUENODE_OPERATORS")) {
        printf("%s:%d operator()\n", __FILE__, __LINE__);
    }

    Segment segment((*segment_)(t).get(Segment()));

    etl::hermite<Vector> curve(segment.p1, segment.p2, segment.t1, segment.t2);

    return curve((*amount_)(t).get(Real()));
}

bool
ValueNode_SegCalcVertex::check_type(Type &type)
{
    return type == type_vector;
}

bool
ValueNode_SegCalcVertex::set_link_vfunc(int i, ValueNode::Handle value)
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        CHECK_TYPE_AND_SET_VALUE(segment_, type_segment);

    case 1:
        CHECK_TYPE_AND_SET_VALUE(amount_,  type_real);
    }

    return false;
}

ValueNode::LooseHandle
ValueNode_SegCalcVertex::get_link_vfunc(int i)const
{
    assert(i >= 0 && i < link_count());

    if (i == 0) {
        return segment_;
    }

    if (i == 1) {
        return amount_;
    }

    return 0;
}

LinkableValueNode*
ValueNode_SegCalcVertex::create_new()const
{
    return new ValueNode_SegCalcVertex(type_vector);
}

LinkableValueNode::Vocab
ValueNode_SegCalcVertex::get_children_vocab_vfunc()const
{
    if (children_vocab.size()) {
        return children_vocab;
    }

    LinkableValueNode::Vocab ret;

    ret.push_back(ParamDesc(ValueBase(), "segment")
                  .set_local_name(_("Segment"))
                  .set_description(_("The Segment where the vertex is linked to"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "amount")
                  .set_local_name(_("Amount"))
                  .set_description(_("The position of the linked vertex on the Segment (0,1]"))
                 );
    return ret;
}